Send "Accept-Encoding" header in read request (#4421)
Send "Accept-Encoding" header in read request (#4421)

We should be doing this since we only accept Snappy-encoded responses.

Signed-off-by: Henri DF <6fe7fc73a930152bf7b76d88ca0fed52f4aa62b2@gmail.com>
kangwoo/prometheus,kangwoo/prometheus,Gouthamve/prometheus,Gouthamve/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,Gouthamve/prometheus,alileza/prometheus,keegancsmith/prometheus,kangwoo/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,prometheus/prometheus,Gouthamve/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,alileza/prometheus,prometheus/prometheus,kangwoo/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,GoogleCloudPlatform/prometheus